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MX.MobileMovements = function (cam) {
var touching = true,
moving = false,
startTime = null,
v = 12,
vr = Math.PI * 0.012,
vx = vy = vz = 0;
var directionLocked = false,
directionLockThreshold = 5
var pos = { x: 0, y: viewHeight, z: 0, rotationX: 0, rotationY: 0 }
var pointX, pointY, deltaX, deltaY, distX = 0, distY = 0, absDistX = 0, absDistY = 0, startTime
var rotationX = 0, rotationY = 0, destRotationX = 0, destRotationY = 0
var rotationSum = 0
var rotationMedian = 0
var orientationMax = 0
var samples = 0
var sampleThreshold = 120
var lastAlpha
var is_portrait
var exports = {
init: function () {
exports.orientationchange()
document.addEventListener("touchstart", exports.touchstart)
document.addEventListener("touchmove", exports.touchmove)
document.addEventListener("touchend", exports.touchend)
window.addEventListener('orientationchange', exports.orientationchange)
window.addEventListener("devicemotion", exports.devicemotion)
window.addEventListener("deviceorientation", exports.deviceorientation)
},
touchstart: function(e){
if (e.touches.length == 1) {
touching = true
startTime = Date.now()
var point = event.touches[0]
pointX = point.pageX
pointY = point.pageY
distX = distY = 0
pos.x = cam.x
pos.z = cam.z
pos.rotationY = cam.rotationY
}
},
touchmove: function(e){
e.preventDefault()
if (e.touches.length == 1) {
var timestamp = Date.now()
var point = event.touches[0]
deltaX = point.pageX - pointX
deltaY = point.pageY - pointY
pointX = point.pageX
pointY = point.pageY
distX += deltaX
distY += deltaY
absDistX = abs(distX)
absDistY = abs(distY)
}
},
touchend: function(e){
e.preventDefault()
if (e.touches.length == 0) {
touching = directionLocked = false
var timestamp = Date.now()
var duration = startTime - timestamp
if (duration < 300) {
}
}
},
orientationchange: function(e){
is_portrait = window.innerWidth < window.innerHeight
if (is_portrait) {
lastAlpha = 0
}
},
devicemotion: function(e) {
if (! is_portrait) return;
var rotationBeta = e.rotationRate.alpha; // weird!
rotationSum += rotationBeta;
samples += 1;
},
deviceorientation: function (e) {
if (! lastAlpha) { lastAlpha = e.alpha }
is_portrait ? exports.portraitorientation(e) : exports.landscapeorientation(e)
},
portraitorientation: function(e) {
// compass gives most accurate orientation in portrait mode
var alpha, dx = 0, dy = 0
if (e.webkitCompassHeading) {
alpha = 180 - e.webkitCompassHeading;
}
else {
alpha = 180 - e.alpha;
}
// android rotates in reverse
if (is_android) {
alpha = 360 - alpha
}
// use rotationRate to gauge if we've tilted the screen past vertical
// for looking at ceiling
if (e.beta > orientationMax) {
orientationMax = e.beta
rotationMedian = rotationSum
}
// this number was only going to 83 max.. not 90.. weird
var beta = e.beta + 7;
// if we've got enough motion data, we should be able to determine
// if we've tilted backwards. otherwise, lock to the horizon.
if (! is_android && samples > sampleThreshold) {
dx = rotationSum > rotationMedian ? e.beta - 90 : 90 - e.beta
}
else {
dx = 0
}
// avoid jumping around in a circle
if (Math.abs(alpha - lastAlpha) < 100 || Math.abs(alpha - lastAlpha) > 300) {
dy = alpha - lastAlpha
lastAlpha = alpha
}
// avoid jumping around in a circle #2
if (dy > 300) {
dy -= 360
} else if (dy < -300) {
dy += 360
}
destRotationX = MX.toRad(dx)
destRotationY += MX.toRad(dy)
},
landscapeorientation: function (e) {
var dx, dy
dx = e.gamma > 0 ? 90 - e.gamma : 90 + e.gamma
dy = e.alpha - lastAlpha
lastAlpha = e.alpha
// avoid the sudden jump from 0 to -360
if (dy > 300) {
dy -= 360
}
else if (dy < -300) {
dy += 360
}
destRotationX = MX.toRad(dx)
destRotationY += MX.toRad(dy)
},
update: function () {
var drx, dry
dry = (destRotationY - rotationY) / 6
drx = (destRotationX - rotationX) / 6
rotationY += dry
rotationX += drx
cam.rotationY = pos.rotationY += dry
cam.rotationX = pos.rotationX += drx
if (distX || distY) {
var oldDistY = absDistY, oldDistX = absDistX
absDistY = avg(absDistY, 0, 5)
var dy = (oldDistY - absDistY) * sign(distY) * 2
absDistX = avg(absDistX, 0, 5)
var dx = (oldDistX - absDistX) * sign(distX) * 2
distY = sign(distY) * absDistY
distX = sign(distX) * absDistX
pos.x -= dy * Math.cos(pos.rotationY + Math.PI / 2)
pos.z -= dy * Math.sin(pos.rotationY + Math.PI / 2)
cam.rotationY = pos.rotationY += dx / (window.innerWidth) * Math.PI / 2
app.tube("move", pos)
}
},
lock: function(){ locked = true },
unlock: function(){ locked = false },
scale: function(n){ if (n) scale = n; return scale },
resetScale: function(n){ scale = DEFAULT_SCALE },
gravity: function(g){ return typeof g == "boolean" ? gravity = g : gravity },
velocity: function(n){ v = clamp(n, 1, 50) },
jumpVelocity: function(n){ jumpV = clamp(n, 1, 50) },
}
return exports
}
// function momentum (current, start, time, lowerMargin, wrapperSize, deceleration) {
// var distance = current - start,
// speed = Math.abs(distance) / time,
// destination,
// duration;
//
// deceleration = deceleration === undefined ? 0.0006 : deceleration;
//
// destination = current + ( speed * speed ) / ( 2 * deceleration ) * ( distance < 0 ? -1 : 1 );
// duration = speed / deceleration;
//
// if ( destination < lowerMargin ) {
// destination = wrapperSize ? lowerMargin - ( wrapperSize / 2.5 * ( speed / 8 ) ) : lowerMargin;
// distance = Math.abs(destination - current);
// duration = distance / speed;
// } else if ( destination > 0 ) {
// destination = wrapperSize ? wrapperSize / 2.5 * ( speed / 8 ) : 0;
// distance = Math.abs(current) + destination;
// duration = distance / speed;
// }
//
// return {
// destination: Math.round(destination),
// duration: duration
// };
// }
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